Question

Hi, I'm French , can you correct my faults pls?

Good evening!
First, I would like to thank the organizers for this wonderful evening, also you for your presence and interest.
Though, who would be disinterested? Who has not fantasized about coming one day face to face with a Martian? Well, tonight, your dream has come true! Except you may be disappointed this incredible adventure did not turn us into little green creatures ...
Humans’ quest has always been to go faster, to go farther, and to conquer new territories. Our history bears so many extraordinary examples of what we have been able to achieve, including going to the Moon! Yet, going to Mars seemed to be the ultimate unreachable goal. It was tiring, yes, to survive in off-terrestrial conditions. And without my experiences in space, I would not be able to walk right now. I am obviously standing hard …
But this priceless journey has given our nation an invaluable title! As the commander of Ares 1, I cannot begin to tell you how honored to have been part of it and how proud I am to have planted the flag of our dear America on Mars!
Thank you.

Answer 1

1. When you say "Except you may be disappointed this incredible adventure did not turn us into little green creatures," you might want to correct it to, "Except, you may be disappointed... This incredible adventured did not turn us into little green creatures."

2. When you say, "I am obviously standing hard," that doesn't make much sense. Instead, try saying something like, "I am obviously not standing very well," or, "I am obviously standing very lopsided!"

Otherwise, you have AMAZING English! Keep at it!